User`s manual

MGate MB3000 User’s Manual Getting Started
2-4
Connecting Power
The unit can be powered using the AC adaptor or by connecting a power source to the terminal
block.
Follow these instructions to supply power using the AC adaptor:
1. Plug the connector of the power adapter into the DC-IN jack on the back of the unit.
2. Plug the power adapter into an electrical outlet.
Follow these instructions to connect a power source to the terminal block:
1. Loosen or remove the screws on the terminal block.
2. Connect the 12-48 VDC power line to the terminal block.
3. Tighten the connections using the screws on the terminal block.
Note that the unit does not have an on/off switch. It automatically turns on when it receives power.
The PWR LED on the top panel will glow to indicate that the unit is receiving power.
Connecting Serial Devices
The unit’s serial port(s) are located on the back panel. There are two options for connecting serial
devices, depending on the serial interface:
1. You may use a DB9-to-DB9 cable to connect a serial device to the unit. Plug one end of the
cable into the port on the unit’s back panel and plug the other end of the cable into the device’s
serial port.
2. You may make your own customized serial cable to connect a serial device to the unit. For the
pin assignments of the unit’s serial port, please refer to Chapter 5. This information can then be
used to construct your own serial cable.
If you are connecting a RS-485 multidrop network with multiple devices, please note the
following:
1. All devices that are connected to a single serial port must use the same protocol (i.e., either
Modbus RTU or Modbus ASCII).
2. Each master device must get its own port on the unit. If you are connecting a network with
both master and slave devices, the master must be connected on a separate port from the
slaves. Furthermore, the master will only be able to communicate to Modbus TCP slaves, not
to the ASCII or RTU slaves that are connected on a different serial port.
Connecting to a Host or the Network
A 10/100BaseT Ethernet jack is located on the unit’s front panel. This jack is used for the unit’s
connection to a host or Ethernet network, as follows:
1. For normal operation, use a standard straight-through Ethernet cable to connect the unit to your
Modbus TCP network.
2. For initial configuration or for troubleshooting purposes, you may connect the unit directly to a
PC. In this case, use a crossover Ethernet cable to connect the unit to your PC’s Ethernet
connector.
The unit’s Link LED will light up to indicate a live Ethernet connection.
RS-485 Termination and Pull High/Low Resistors
In some critical RS-485 environments, you may need to add termination resistors to prevent the
reflection of serial signals. When using termination resistors, it is important to set the pull
high/low resistors correctly so that the electrical signal is not corrupted. For each serial port, DIP